              M           V    1\ 2MV²                                                                 
        T                                    4—10  a                                         Ua    Ua    4—6     
                                                        4—10  b                             4—6               4—10            2 \ 3kT       a                     b                     
         4—10  a                                                                         4—10  b         
                                  4—10  a                                                                                                 
                                                                
         4—10  a                           4—10  b                              
                                                                              